/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.geode.redis.internal.executor.string;

import java.util.List;

import org.apache.geode.cache.Region;
import org.apache.geode.redis.internal.ByteArrayWrapper;
import org.apache.geode.redis.internal.Command;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;

public class GetSetExecutor extends StringExecutor {

  private final int VALUE_INDEX = 2;

  @Override
  public void executeCommand(Command command, ExecutionHandlerContext context) {
    List<byte[]> commandElems = command.getProcessedCommand();

    Region<ByteArrayWrapper, ByteArrayWrapper> r = context.getRegionProvider().getStringsRegion();

    if (commandElems.size() < 3) {
      command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.GETSET));
      return;
    }

    ByteArrayWrapper key = command.getKey();
    checkAndSetDataType(key, context);

    byte[] newCharValue = commandElems.get(VALUE_INDEX);
    ByteArrayWrapper newValueWrapper = new ByteArrayWrapper(newCharValue);

    ByteArrayWrapper oldValueWrapper = r.get(key);
    r.put(key, newValueWrapper);

    if (oldValueWrapper == null) {
      command.setResponse(Coder.getNilResponse(context.getByteBufAllocator()));
    } else {
      command.setResponse(Coder.getBulkStringResponse(context.getByteBufAllocator(), oldValueWrapper.toBytes()));
    }

  }
}
